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A.Kropivnitskaya

A.Kropivnitskaya. Inclusive Photoproduction of Light Mesons at HERA ( h, r 0 , f 0 (980) and f 2 (1270) ). ITEP, Moscow. On behalf of H1 Collaboration. HERA – a laboratory for hadroproduction. dN/dy. plateau. rapidity y. В.

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A.Kropivnitskaya

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  1. A.Kropivnitskaya Inclusive Photoproduction of Light Mesons at HERA (h, r0, f0(980) andf2(1270) ) ITEP, Moscow On behalf of H1 Collaboration

  2. HERA – a laboratory for hadroproduction dN/dy plateau rapidity y В Universality in the behaviour of hadroproduction in central rapidity plateau in the hadronic events. Features ofQCD vacuum.

  3. Particle production measurements at high energy + - has been measured / ? - no experimental information

  4. Photoproduction Data Selection g + p h + X e <W > = 210 GeV r0, f0, f2 p+p- g gp h gg h+X p e ds ds and to be measured dydpT2 dy h =h, r0, f0(980) orf2(1270) p = track in CJC g = cluster in LAr |ylab| < 1 for h

  5. Comparison of Data vs Monte Carlo Simulation [GeV] E D [cm] clust R [cm] ct tr MC DATA N q track track Good agreement between Data and simulation enables reliable calculation of the efficiencies and detector effects | cos(a)|

  6. Fit Procedure

  7. H1 inclusive of r0, f0 and f2 photoproduction dN/dM [1/GeV] M(p+p-) [GeV]

  8. H1 inclusive of h photoproduction H1 Preliminary 3 < pT < 8 GeV |y|<1 dN/dM [1/GeV] Fit = Gaussian + Polynomial M(gg) [GeV]

  9. Statistical and Systematic Errors f0

  10. H1 inclusive meson photoproduction <Wgp> = 210 GeV H1 Priliminary ds/dy [nb] ds/(dydpT2) [nb/GeV2] r0 f0 f2 h y PT [GeV]

  11. Universal behaviour of hadron photoproduction HERA photoproduction 1/(2j+1)ds/(dydpT2) [nb/GeV2] } r0 f0 H1 Prelim f2 h p+published M+PT [GeV]

  12. Conclusions 1. The first measurement of inclusive h, r0, f0(980) andf2(1270) mesons at HERA (H1 experiment). 2. Preliminary results on differential meson photoproduction cross-sections. 3.The inclusive cross-section for hadronic resonances has approximately the same behavior as observed for long-lived hadrons

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